Publications by authors named "Florian Schadow"
Air-Coupled Ultrasonic Ferroelectret Receiver With Additional Bias Voltage.
IEEE Trans Ultrason Ferroelectr Freq Control
October 2019
Article Synopsis
- - High sensitivity in air-coupled ultrasonic sensors is crucial for effective materials testing, and charged cellular polypropylene (PP) offers advantages over traditional piezoelectric materials due to its lower acoustic impedance and comparable piezoelectric coefficient.
- - The charged cellular PP can generate internal voltage through its polarization, and applying a dc bias voltage enhances sensor sensitivity, with experiments showing increases in signal-to-noise ratio of up to 15 ± 1 dB.
- - This research introduces the first ultrasonic sensor utilizing charged cellular PP with a high-voltage module (up to 2 kV), successfully imaging the internal structure of various materials, including rotor blade segments and glued-laminated timber.